heat and a/c only blowing out of window vent

Asked by Apr 05, 2014 at 04:36 AM about the 2002 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

I only have heat and a/c blowing out of my window vent

2 Answers


Sounds like one of your blend doors behind the dash is malfunctioning. You will probably want to take it to the dealer. Not a fun job.


The default for a failed HVAC system is Defrost & heat. There's the possibility that the vacuum line from the intake or from the reservoir is disconnected or broken, the check valve has failed or the control head is inop.

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